Taking good pictures in snow ???

I have Panasonic G5 with kit lens (14-42mm + 45-140mm) + Tiffin Circular Polarizer (52mm). I am new to photography and usually use Auto mode with minor tuning.

This is the first time I am visiting to the place, which is full of place, with my family. I never clicked pictures in snow, but I heard that some grey effect come if we click pictures in Auto mode. What mode should I select, so that it should not spoil my family pictures.